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    single op amp bandpass filter

    could anyone explain the working of the circuit, given in the link below-
    http://www.ecircuitcenter.com/Circui...B_bandpass.htm

    thanks in advance..

    •   Alt16th July 2008, 21:28

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    LvW
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    narrow band pass filter using op-amp

    Quote Originally Posted by sarika
    could anyone explain the working of the circuit, given in the link below-http://www.ecircuitcenter.com/Circuits/MFB_bandpass/MFB_bandpass.htm
    .
    The most simple explanation is as follows:
    1.) Very low frequencies are blocked by C2 and, therefore, cannot appear at the opampoutput;
    2.) Very high frequencies are fed back to the inverting opamp input with a factor of nearly "1" (via C1 and C2) - thus, they are amplified by nearly "zero".
    3.) As a consequence: the circuit has a bandpass property.
    4.) A somewhat more "theoretical" explanation is the folowing:
    The feedback network is, in principle; a "bridget-T" network which is known to exhibit a complex "zero". Due to the feedback action of the opamp the complex zero is transferred to a complex pole pair.


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